US4535843A - Method and apparatus for obtaining selected samples of formation fluids - Google Patents
Method and apparatus for obtaining selected samples of formation fluids Download PDFInfo
- Publication number
- US4535843A US4535843A US06/618,613 US61861384A US4535843A US 4535843 A US4535843 A US 4535843A US 61861384 A US61861384 A US 61861384A US 4535843 A US4535843 A US 4535843A
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- United States
- Prior art keywords
- tool
- bore hole
- fluid
- sample
- withdrawn
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000012530 fluid Substances 0.000 title claims abstract description 116
- 238000000034 method Methods 0.000 title claims abstract description 34
- 230000015572 biosynthetic process Effects 0.000 title claims description 32
- 238000012360 testing method Methods 0.000 claims abstract description 61
- 238000005070 sampling Methods 0.000 claims abstract description 7
- 238000007789 sealing Methods 0.000 claims description 17
- 238000005259 measurement Methods 0.000 claims description 11
- 238000005086 pumping Methods 0.000 claims description 10
- 238000005553 drilling Methods 0.000 claims description 7
- 230000000704 physical effect Effects 0.000 claims 6
- 238000004891 communication Methods 0.000 claims 4
- 238000007599 discharging Methods 0.000 claims 2
- 230000008054 signal transmission Effects 0.000 claims 2
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- 238000004519 manufacturing process Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
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- 238000013022 venting Methods 0.000 description 2
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- 229910052787 antimony Inorganic materials 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
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- 238000005859 coupling reaction Methods 0.000 description 1
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- 230000005251 gamma ray Effects 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
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Images
Classifications
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/081—Obtaining fluid samples or testing fluids, in boreholes or wells with down-hole means for trapping a fluid sample
- E21B49/082—Wire-line fluid samplers
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B33/00—Sealing or packing boreholes or wells
- E21B33/10—Sealing or packing boreholes or wells in the borehole
- E21B33/12—Packers; Plugs
- E21B33/124—Units with longitudinally-spaced plugs for isolating the intermediate space
- E21B33/1243—Units with longitudinally-spaced plugs for isolating the intermediate space with inflatable sleeves
-
- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21B—EARTH OR ROCK DRILLING; OBTAINING OIL, GAS, WATER, SOLUBLE OR MELTABLE MATERIALS OR A SLURRY OF MINERALS FROM WELLS
- E21B49/00—Testing the nature of borehole walls; Formation testing; Methods or apparatus for obtaining samples of soil or well fluids, specially adapted to earth drilling or wells
- E21B49/08—Obtaining fluid samples or testing fluids, in boreholes or wells
- E21B49/10—Obtaining fluid samples or testing fluids, in boreholes or wells using side-wall fluid samplers or testers
Definitions
- This invention relates to a method and apparatus for obtaining samples of formation fluids at different levels in a bore hole.
- the characteristics of formation fluids obtained from various levels within a bore hole are of considerable interest to geologists as an aid to determining subsurface structure as well as to those engaged in well completion and production.
- This invention provides a method and apparatus for lowering a logging tool into an uncased bore hole on a conventional wireline, positioning the tool at preselected elevations and obtaining formation fluid samples. The samples are tested within the tool without withdrawing it from the bore hole and the test results transmitted to the surface. If it is determined that the sample should be recovered it is transferred to one of a plurality of collection chambers within the tool, and, if not, it is ejected into the bore hole. The logging tool can then be moved to another level, without withdrawal from the well and the process repeated until all of the sample collection chambers in the tool are filled.
- Formation fluid sample collection tools have been in use in the industry for a number of years. See for example the descriptive matter found in the Composite Catalog of Oil Field Equipment and Services--1978-1979, pages 3286-3291 for a description of services and equipment provided by Halliburton Services. See also in the 1976-1977 edition of the same catalog the description of the Johnson Inflatable Packer Test Systems at pages 3607-3609. Both the Halliburton and Johnson systems involve attaching the sampling tool to the drill pipe string and are not designed for wireline logging. Moreover, they do not have means for isolating and testing formation fluids at various selected levels within the bore hole to make a determination as to the desirability of collecting and retaining the sample without withdrawal of the tool from the well.
- Wireline formation testers have been available since the early 1950's and have been used to obtain fluids, flow rates and pressures from prospective reservoirs. Because of limited tool capacity and capabilities, however, recovered fluids often are entirely or mostly drilling mud filtrate. Moreover, there is no fluid property monitoring capability. Thus these tools are useful only in the case of reservoirs where adequate flow is obtained and recovered fluids are relatively free of mud filtrate. They tend not to be useful in those cases where geological exploration is involved and fluid samples other than those containing hydrocarbon are desired.
- a primary object of this invention is to provide a method for obtaining a plurality of high quality samples of formation fluids from the wall of a bore hole on a single passage of a logging tool into the bore hole by locating the tool at various levels within the bore hole, isolating an interval of the bore hole, withdrawing fluid from the isolated interval, testing the properties of the withdrawn fluid while within the tool, transmitting the test results to the surface for determination of the suitability of the sample for collection and, if it is found suitable, transferring the sample to a collection chamber within the tool for ultimate removal to the surface.
- a second and related object of this invention is to provide a logging and sample collecting tool operable in connection with a conventional wireline for carrying out the method of this invention.
- This invention is directed to an improved method and apparatus for obtaining information fluid samples from a bore hole.
- the method involves initially lowering a tool suspended by a wireline into the bore hole to a preselected level; and utilizing a pair of packers carried by the tool to isolate an interval of the bore hole by inflating the packers to expand them into sealing contact with said bore hole. Fluid is withdrawn from the isolated interval between the packers and its electrical resistivity is measured in a resistivity test chamber located within the tool.
- the resistivity measurement is sent to the surface via the wireline and when the resistivity becomes constant, indicating that formation fluids uncontaminated by drilling mud components are being withdrawn into the tool, the withdrawn fluids are directed into a second test chamber wherein the redox potential (Eh), acidity (pH) and temperature of the fluids are measured and the results are sent to the surface by the wireline. It is then determined from the thus transmitted results whether it is desired to retain a sample and, if determination is positive, the fluid is pumped to one of a plurality of sample collection chambers within said tool. If the determination is negative, the fluid is returned to the bore hole, the packers are deflated to free the tool for vertical movement and the tool is moved to another preselected location; where the above-referred to steps are repeated. This procedure is followed until the sample chambers in the tool are filled with desired samples, and finally the wireline is retracted to return the tool and the contained samples to the surface.
- Eh redox potential
- pH acidity
- a preferred embodiment of the apparatus of this invention comprises a tool adapted to be introduced into a bore hole on a conventional seven conductor wireline and having a pair of spaced apart inflatable packers for isolating an interval of the bore hole.
- a hydraulic pump is provided within the tool for pumping fluids from the interval between the packers, initially for inflating the packers, and subsequent to their inflation for pumping fluids through a resistivity test chamber and a second test chamber where redox potential (Eh), acidity (pH) and temperature measurements are obtained, and finally into one or more sample collection chambers located within the tool.
- Conventional means are associated with each of the chambers for performing the above-described measurement and for transmission of the results thereof to the surface through the wireline.
- suitable valve means electrically controlled from the surface for sequentially carrying out the method steps of this invention.
- FIG. 1 is a side view of a preferred embodiment of a logging tool of this invention disposed within a section of a bore hole;
- FIG. 2 is a schematic view showing the relationship of the various elements of the tool of this invention during the packer inflation step
- FIG. 3 is a similar view showing the relationship of the elements during the testing step.
- FIG. 4 is a similar view showing the relationship during the sample collection step.
- FIG. 1 a preferred embodiment of the tool 10 of this invention is shown in a downhole position in a bore hole 11.
- the tool is made up in tubular sections 12 through 16 which are connected in sealed relationship by collars 17.
- the tool 10 is suspended from the cable head section 16 to which the supporting wireline 21 is securely attached by coupling 22.
- the use of individual section 12-16 each containing certain kinds of components is, of course, optional but it provides a convenient way to manufacture, assemble and service the tool 10.
- the maximum diameter of the tool 10 is, of course, limited by the size of the bore hole 11 and the effectiveness of the expandable packers 20.
- a convenient arrangement is to make the sections 13-16 of somewhat smaller diameter so that these portions of the tool can be utilized in smaller bore holes and to utilize a packer section 12 appropriately sized to perform adequate sealing in a particular bore hole to be tested and sampled.
- the following Table gives preferred packer sizes for different bore hole diameters:
- the maximum diameter of the sections 13-16 is about five inches.
- the length of a tool of five-inch diameter will depend upon the degree of miniaturization in hydraulic and electric circuitry and in the size and number of samples which are to be collected. Usually the length is between 6 and 12 feet.
- FIGS. 2-4 the hydraulic relationship of the various parts of the tool 10 during various steps of the preferred method are shown.
- the main fluid flow for the particular step involved is indicated by a heavy line.
- FIG. 2 the step of inflating the packers is illustrated.
- Fluid from the bore hole 11 is withdrawn into the tool 10 through an open port 24 in packer section 12 passing through a filter 25 and resistivity test chamber 26.
- This test chamber which is preferably conventional can contain a pair of spaced apart electrodes across which a voltage is impressed. The resulting current flow between the electrodes provides an indication of resistivity.
- Suction for withdrawing the fluid is provided by a pump 27 driven by an electric motor 28 powered from the surface by an electric current delivered through the wireline 21. From pump 27 the withdrawn fluid passes through conduit 30 to the packers 20 which are inflated thereby to engage the wall of the wellbore in sealing relationship and isolate an interval thereof.
- a passage 29 is provided through the packer section 12 as shown in FIG. 1.
- a pressure relief valve shown at 31 vents fluid to the bore hole when the packers 20 are filled.
- a back flow check valve 32 prevents fluid from flowing back out of the packers 20 when pump 27 is not operating.
- An electrically controlled packer deflate valve 33 is provided for venting conduit 30 to the wellbore when it is desired to deflate the packers 20.
- the pump 27 continues to pump fluid from the bore hole through the resistivity test chamber venting the fluid to the bore hole through valve 31. This action is preferably continued until the resistivity measurement, which is conveyed to the surface through the wireline 21, becomes constant indicating that formation fluids free of drilling mud components are being withdrawn. At such time the pump 27 is stopped and the various valves are set to provide the flow pattern shown in FIG. 3.
- a preferred procedure is to use a pair of rotary solenoid actuated valves (not shown) which are positioned by pulses sent down from the surface.
- a pair of rotary solenoid actuated valves (not shown) which are positioned by pulses sent down from the surface.
- one of these rotary solenoid valves is employed to control the pumping of samples to the sample containers and the other is preferably employed to control all of the other fluid flows.
- the flow control valve (not shown) is rotated to place the schematically indicated valve elements in the positions shown in FIG. 3.
- the filter control valve element 35 is actuated to cause the fluid to flow through line filter 36 instead of the large coarse filter 25 improving the quality of the withdrawn sample and the control valve 37 is actuated to divert the fluid flow through the second test chamber 38 to the bore hole 11.
- the second test chamber 38 preferably contains a three electrode system for meausuring acidity (pH) and redox potential (Eh).
- a temperature sensor (not shown) is also provided as the temperature at which potential readings are made affects calibration.
- the preferred electrodes are as follows:
- test chamber 38 may be desirable to adapt the test chamber 38 to perform other or additional kinds of tests such as retractive index, opacity, density of dissolved gas content all of which are known to those familiar with the art.
- Conventional electrical circuits are utilized to send appropriate signals through the wireline to the surface where pH, Eh and temperature of the formation fluid can be displayed or read out. It should be noted in FIG. 3 that a portion of the fluid does not pass through test chamber 38 but passes through sample control valve 40 and back to the bore hole 11 through conduit 41.
- test chamber 38 is not overloaded and there is more certainty of obtaining a sample representative of the fluid undergoing test in chamber 38 with the same fluid also simultaneously flowing to and through the sample control valve 40.
- the pump 27 is stopped and the sample control valve 40 is electrically actuated to a position to discontinue flow of fluid to the bore hole through conduit 41 and to instead convey fluid to the first sample chamber indicated at 42.
- the chambers need not be evacuated or vented to the bore hole 11 as downhole pressures are so large that any air brought down from the surface in the tool 10 will be so compressed as to occupy but a small fraction of chamber volume.
- sample chamber 42 has been filled the pump 27 is stopped and the rotary control valve is actuated to packer deflate position opening the valve port indicated at 33 to the bore hole and permitting the packers 20 to deflate.
- Suitable valved connections (not shown) are provided through the side of tool 10 for withdrawal of the samples from the chambers 42.
- the tool 10 is again free to be moved to other preselected levels in the bore hole 11, and the above described steps can be repeated.
- the pump 27 can be stopped, the packers 20 deflated and the tool moved to another level.
- the capability of determining formation fluid pressure is provided by means of a presssure sensor 45 connected to the fluid conduit downstream of the pump 27.
- This sensor 45 which preferably contains a transducer monitors formation fluid pressure during periods when the pump 27 is not operating and sends appropriate signals through the wireline 21 to the surface.
- any of the conventional logging techniques such as gamma ray, neutron, induction, sonic, etc., adaptable for wireline logging, can be practiced in conjunction with the method and apparatus of this invention by incorporating appropriate conventional sensing and transmission apparatus within the tool 10.
- Information from such ancillary apparatus can be of considerable aid in initially placing the tool in the bore hole for the testing and sampling procedure of this invention.
- the words "bore hole” have been used herein and in the claims in their generic sense and are meant to include any cased or uncased generally cylindrical opening, sealable by means of a packer and whether intended for exploration or production purposes.
- the expression includes drill hole, well bore and other equivalent terms.
- circuitry for obtaining signals from the various sensing devices and transmitting them to the surface and for transmitting electrical commands from the surface to the tool have not been included as these techniques are well known to those skilled in the art and a multitude of different arrangements are available and may be used in the practice of this invention.
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- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Geology (AREA)
- Mining & Mineral Resources (AREA)
- Physics & Mathematics (AREA)
- Environmental & Geological Engineering (AREA)
- Fluid Mechanics (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Sampling And Sample Adjustment (AREA)
Abstract
Description
TABLE ______________________________________ Minimum Bore Hole Diameter Packer Size Packer Expansion In Inches in Inches Capacity in Inches ______________________________________ 6.25 5.00 9.00 7.88 6.25 11.25 8.75 7.25 13.00 ______________________________________
Claims (16)
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US06/618,613 US4535843A (en) | 1982-05-21 | 1984-06-08 | Method and apparatus for obtaining selected samples of formation fluids |
US06/732,523 US4635717A (en) | 1984-06-08 | 1985-05-09 | Method and apparatus for obtaining selected samples of formation fluids |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US38068982A | 1982-05-21 | 1982-05-21 | |
US06/618,613 US4535843A (en) | 1982-05-21 | 1984-06-08 | Method and apparatus for obtaining selected samples of formation fluids |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US38068982A Continuation | 1982-05-21 | 1982-05-21 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/732,523 Continuation US4635717A (en) | 1984-06-08 | 1985-05-09 | Method and apparatus for obtaining selected samples of formation fluids |
Publications (1)
Publication Number | Publication Date |
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US4535843A true US4535843A (en) | 1985-08-20 |
Family
ID=27009091
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US06/618,613 Expired - Lifetime US4535843A (en) | 1982-05-21 | 1984-06-08 | Method and apparatus for obtaining selected samples of formation fluids |
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US (1) | US4535843A (en) |
Cited By (56)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4795539A (en) * | 1985-03-13 | 1989-01-03 | Oronzio De Nora S.A. | System and use thereof for collecting chemical-physical, electrochemical and mechanical parameters for designing and/or operating cathodic protection plants |
US4860581A (en) * | 1988-09-23 | 1989-08-29 | Schlumberger Technology Corporation | Down hole tool for determination of formation properties |
US4898236A (en) * | 1986-03-07 | 1990-02-06 | Downhole Systems Technology Canada | Drill stem testing system |
WO1990008878A1 (en) * | 1989-02-01 | 1990-08-09 | Atlantic Richfield Company | Tubing conveyed wellbore fluid flow measurement system |
US5095983A (en) * | 1990-10-02 | 1992-03-17 | Chevron And Research And Technology Company | Multiphase production evaluation method using thru-tubing, wireline packoff devices |
US5137086A (en) * | 1991-08-22 | 1992-08-11 | Tam International | Method and apparatus for obtaining subterranean fluid samples |
US5267617A (en) * | 1991-08-08 | 1993-12-07 | Petro-Tech Incorporated | Downhole tools with inflatable packers and method of operating the same |
WO1994000671A1 (en) * | 1992-06-19 | 1994-01-06 | Western Atlas International, Inc. | Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface formations |
US5297634A (en) * | 1991-08-16 | 1994-03-29 | Baker Hughes Incorporated | Method and apparatus for reducing wellbore-fluid pressure differential forces on a settable wellbore tool in a flowing well |
US5323648A (en) * | 1992-03-06 | 1994-06-28 | Schlumberger Technology Corporation | Formation evaluation tool |
EP0610098A1 (en) * | 1993-02-04 | 1994-08-10 | Halliburton Company | Downhole fluid property measurement |
US5350018A (en) * | 1993-10-07 | 1994-09-27 | Dowell Schlumberger Incorporated | Well treating system with pressure readout at surface and method |
US5417289A (en) * | 1993-12-30 | 1995-05-23 | Carisella; James V. | Inflatable packer device including limited initial travel means and method |
US5469919A (en) * | 1993-12-30 | 1995-11-28 | Carisella; James V. | Programmed shape inflatable packer device and method |
US5473939A (en) * | 1992-06-19 | 1995-12-12 | Western Atlas International, Inc. | Method and apparatus for pressure, volume, and temperature measurement and characterization of subsurface formations |
US5497091A (en) * | 1994-09-01 | 1996-03-05 | Applied Research Associates, Inc. | Surface mounted pH sensor for cone penetration testing |
US5495892A (en) * | 1993-12-30 | 1996-03-05 | Carisella; James V. | Inflatable packer device and method |
US5540280A (en) * | 1994-08-15 | 1996-07-30 | Halliburton Company | Early evaluation system |
US5549159A (en) * | 1995-06-22 | 1996-08-27 | Western Atlas International, Inc. | Formation testing method and apparatus using multiple radially-segmented fluid probes |
US5555945A (en) * | 1994-08-15 | 1996-09-17 | Halliburton Company | Early evaluation by fall-off testing |
US5577560A (en) * | 1991-06-14 | 1996-11-26 | Baker Hughes Incorporated | Fluid-actuated wellbore tool system |
WO1997008424A1 (en) * | 1995-08-22 | 1997-03-06 | Win Cubed Limited | Downhole tool system |
US5741962A (en) * | 1996-04-05 | 1998-04-21 | Halliburton Energy Services, Inc. | Apparatus and method for analyzing a retrieving formation fluid utilizing acoustic measurements |
US5799733A (en) * | 1995-12-26 | 1998-09-01 | Halliburton Energy Services, Inc. | Early evaluation system with pump and method of servicing a well |
US5826662A (en) * | 1997-02-03 | 1998-10-27 | Halliburton Energy Services, Inc. | Apparatus for testing and sampling open-hole oil and gas wells |
US5887652A (en) * | 1997-08-04 | 1999-03-30 | Halliburton Energy Services, Inc. | Method and apparatus for bottom-hole testing in open-hole wells |
WO2000047870A1 (en) * | 1999-01-26 | 2000-08-17 | Dybdahl Bjoern | A method for use in sampling and/or measuring in reservoir fluid |
WO2000065200A1 (en) * | 1999-04-22 | 2000-11-02 | Schlumberger Technology Corporation | Method and apparatus for testing a well |
US6257338B1 (en) * | 1998-11-02 | 2001-07-10 | Halliburton Energy Services, Inc. | Method and apparatus for controlling fluid flow within wellbore with selectively set and unset packer assembly |
US6343507B1 (en) * | 1998-07-30 | 2002-02-05 | Schlumberger Technology Corporation | Method to improve the quality of a formation fluid sample |
US6347666B1 (en) | 1999-04-22 | 2002-02-19 | Schlumberger Technology Corporation | Method and apparatus for continuously testing a well |
US6349772B2 (en) * | 1998-11-02 | 2002-02-26 | Halliburton Energy Services, Inc. | Apparatus and method for hydraulically actuating a downhole device from a remote location |
US6357525B1 (en) | 1999-04-22 | 2002-03-19 | Schlumberger Technology Corporation | Method and apparatus for testing a well |
US6382315B1 (en) | 1999-04-22 | 2002-05-07 | Schlumberger Technology Corporation | Method and apparatus for continuously testing a well |
WO2002057595A1 (en) * | 2001-01-18 | 2002-07-25 | Shell Internationale Research Maatschappij B.V. | Measuring the in situ static formation temperature |
US6527050B1 (en) | 2000-07-31 | 2003-03-04 | David Sask | Method and apparatus for formation damage removal |
US6550321B1 (en) * | 1997-09-18 | 2003-04-22 | Solinst Canada Limited | Apparatus for measuring and recording data from boreholes |
US20030084716A1 (en) * | 1997-09-18 | 2003-05-08 | Solinst Canada Limited | Apparatus for measuring and recording data from boreholes |
US20030103551A1 (en) * | 2001-11-30 | 2003-06-05 | Sammy Haddad | Method of predicting formation temperature |
US6575242B2 (en) | 1997-04-23 | 2003-06-10 | Shore-Tec As | Method and an apparatus for use in production tests, testing an expected permeable formation |
US20050155760A1 (en) * | 2002-06-28 | 2005-07-21 | Schlumberger Technology Corporation | Method and apparatus for subsurface fluid sampling |
US20050161218A1 (en) * | 2004-01-27 | 2005-07-28 | Halliburton Energy Services, Inc. | Probe isolation seal pad |
US7062958B2 (en) | 2001-07-27 | 2006-06-20 | Schlumberger Technology Corporation | Receptacle for sampling downhole |
US20070119587A1 (en) * | 2001-09-19 | 2007-05-31 | Baker Hughes Incorporated | Dual Piston, Single Phase Sampling Mechanism and Procedure |
US20080066535A1 (en) * | 2006-09-18 | 2008-03-20 | Schlumberger Technology Corporation | Adjustable Testing Tool and Method of Use |
US20080066537A1 (en) * | 2006-09-18 | 2008-03-20 | Schlumberger Technology Corporation | Systems and Methods for Downhole Fluid Compatibility |
US20090183882A1 (en) * | 2006-07-21 | 2009-07-23 | Halliburton Energy Services, Inc. | Packer variable volume excluder and sampling method therefor |
US20100155061A1 (en) * | 2002-06-28 | 2010-06-24 | Zazovsky Alexander F | Formation evaluation system and method |
US20100175873A1 (en) * | 2002-06-28 | 2010-07-15 | Mark Milkovisch | Single pump focused sampling |
US20140290941A1 (en) * | 2011-09-01 | 2014-10-02 | Schlumberger Technology Corporation | Sample Capture Prioritization |
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US9085964B2 (en) | 2009-05-20 | 2015-07-21 | Halliburton Energy Services, Inc. | Formation tester pad |
US9719336B2 (en) | 2014-07-23 | 2017-08-01 | Saudi Arabian Oil Company | Method and apparatus for zonal isolation and selective treatments of subterranean formations |
US10024147B2 (en) * | 2015-01-13 | 2018-07-17 | Halliburton Energy Services, Inc. | Downhole pressure maintenance system using reference pressure |
US10125600B2 (en) | 2015-06-05 | 2018-11-13 | Baker Hughes, A Ge Company, Llc | System and method for sensing fluids downhole |
US11125082B2 (en) | 2015-07-20 | 2021-09-21 | Pietro Fiorentini Spa | Systems and methods for monitoring changes in a formation while dynamically flowing fluids |
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- 1984-06-08 US US06/618,613 patent/US4535843A/en not_active Expired - Lifetime
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